STRUCTURAL AND OPTICAL CHARACTERIZATION OF NANOCRYSTALLINE CuAlS₂ CHALCOPYRITE SYNTHESIZED BY POLYOL METHOD IN AUTOCLAVE

Abstract

Chalcopyrite CuAlS 2 nanoparticles were synthesized with polyol method. The solvothermal with autoclave nanoparticles synthesized are investigated. The amount and temperature of reducer, the solvent of salts could be important parameters that were studied. The nanoparticles were synthesized with CuCl, AlCl 3 and thiourea (SC(NH 2 ) 2 ) as precursors, diethylene glycol ((CH 2 CH 2 OH) 2 O) and polyethylene glycol 600 (HO(C 2 H 4 O)nH) as solvent and capping agent respectively, and ammonia (NH 4 OH) as reducing agent. The parameters of synthesis were studied by X-Ray diffraction (XRD) for analysis of structure, scanning electron microscope (SEM) for morphology and by ultraviolet-visible (UV-VIS) spectrophotometer for analysis of light structure. The possible formation mechanism is also discussed.

Structural and optical properties of Fe and Zn substituted CuInS2 nanoparticles synthesized by a one-pot facile method

“…[7][8][9][10][11] There are two vacuum and vacuum free based deposition methods. Three methods for band engineering are common: 1) composition tuning, 2) size controlling and 3) surface improving.…”

“…[1][2][3][4][5][6] I-III-VI 2 ((I ¼ Cu, Ag), (III ¼ In, Ga, Al), (VI ¼ S, Se, Te)) ternary or quaternary compounds are attractive because of their absorption coefficients which are higher than 10 5 cm À1 , their electrical conductivity can be changed from n-type to ptype with change of intrinsic composition ratio and nally the band gap can be tuned from 0.65 eV for CuFeS 2 to 3.5 eV for CuAlS 2 which is a wide spectral region from near infrared to ultraviolet. [7][8][9][10][11] There are two vacuum and vacuum free based deposition methods. In recent years, the efficiency of the vacuum fabricated CuInGaSe 2 (CIGSe) solar cells is close to 20.8% but this method is rather expensive and complicated compared with the vacuum free method.…”

“…Another motivation is to use the abundant and inexpensive transition metals such as Fe, Zn or Sn instead of expensive materials such as indium to decrease the cost of materials and tune the band gap of the semiconductor. [12][13][14][15][16][17][18][19][20][21][22] Substitution, stoichiometry and phase structure of quaternary CuIn x M 1Àx S 2 (M ¼ Fe, Co, Zn, Sn, Ga and Al) are more difficult than ternary or binary compounds. Therefore, choosing a suitable method for solid solution synthesis is really important to achieve an optimized morphology, structure and optical properties.…”

Synthesis and Characterization of CuZnSe2 Nanocrystals in Wurtzite, Zinc Blende, and Core–Shell Polytypes

“…From a functional application perspective, ternary and quaternary copper-based chalcogenides with indirect bandgap structures, designed for nonradiative applications, can be conceptually derived from II–VI (e.g., CdTe) binary chalcogenides with direct bandgaps by complete replacement of the divalent cations (e.g., Zn, − Fe, − Cd , ) by monovalent cations (e.g., Cu) and other cations of various valence (III–Al, − Ga, − In; − IV–Sn, ,− Ge; − V–Sb, − Bi , ). A number of groups have used this ability to tune composition in addition to nanoscale morphology to attain desired physical and chemical properties. ,, In the well-studied I–III–VI systems, the composition can be tuned in a broad range, both stoichiometrically and nonstoichiometrically, due to the ability to exploit defects or vacancies of the I and III species .…”

One-pot thermolysis synthesis of CuInS2 nanoparticles with chalcopyrite-wurtzite polytypism structure

“…High efficiency thin film solar cells fabricated based on vacuum based techniques, such as molecular beam epitaxy, co-evaporation, sputtering, ion layer gas reaction are costly [11][12][13]. One of trends in this field is reducing the production cost by introducing vacuum free preparation such as electrodeposition, chemical bath deposition, microwave-assisted synthesis, spray pyrolysis [14][15][16][17] and different wet chemical methods [18][19][20][21][22][23][24][25]. The one pot solution synthesis is one of the best wet chemical methods that have non-vacuum, fast, uncomplicated, highly reproducible, inexpensive equipment, low materials waste, proper stoichiometry and stable colloidal solutions.…”